च
The stroke order of this letter is

This letter is pronounced exactly as in Hindi as CH as in ‘Chamber’ in English.
Some more examples of same sound in English are as follows.
CH sound as in ‘Church’ or in ‘Channel’.
While pronouncing च CH in Channel or in Church you would feel some air is being released from mouth while Hindi is just opposite. In Hindi you should not release the air from mouth rather you should pronounce it with some stress.
Some more Example in Hindi are
चल Chal go
चमन Chaman Small Garden
छ
This letter is written as

This letter is closer to the sound of CH in ‘Channel’ or ‘Church’ in English but it has more aspiration. That means while pronouncing this letter in Hindi you have to release more air from mouth while speaking.
Some example in Hindi are
छल Chhal Deceive
छत Chhat Roof